(2x^2 +10x−2)−(−8x^2 +7x+7)

2x^2 + 10x - 2 + 8x^2 - 7x - 7

Combine like terms:

2x^2 + 8x^2 + 10x - 7x - 2 - 7
10x^2 + 3x - 9

The simplified expression is 10x^2 + 3x - 9.